Power saw setting apparatus



AFiled June 13, 1 941 I 30 a5 46 29 M g' 44 3! i 34 27` 75 23 32 42 f Il l l 65 33 25 P 74 7j 70 I;

24 *if *M .6@ "@Z' 944 4751 'I 6 4 ,r- 22 la 7 .55 52 3 50 5 23.. 2jr v 446 72 x 82 Q i /Y/ f l K I Y 14/ l 39 3337 j@ ,fj t INVENTOR--- BYRON G. DAC-:6577; 20 x I Y WM' ATTORNEY 4 Sheets-Sheet 2 Bl G. DAGGETT Filed June 15, 1941 Aug. 22, 1944.

.POWER sAw SETTING APPARATUS Aug. 22, 1944;

Bv. DAGGETT v POWER SW SETTING' APPARATUS Filed Jue 15., -1941 4 sheets-snee; s

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ATTORNEY Aug. 22, 1944. B. G. DAGGETT POWER sAw SETTING APPARATUS i Filed June 1s, 1941 4 sheets-sheet 4 Patented Aug. 22, 1944 UNITED STATES PATENT OFFICE POWER sAW SETTING APPARATUS Byron G. Daggett, San Diego, Calif.y ApplicationJune 13, 1941, Serial No. 397,905 6 Claims.' (o1. 'ze-62) My invention relates to power saw setting apparatus, particularly apparatus for quickly resetting the teeth of hand saws'with precision and accuracy, and its objects are to obtain by mechanical means greater accuracy in bringing 'about the uniform set or reset of alternate teeth of a used hand saw in their required alignment and at the same time to secure such result with all possible speed; to render automatic the setting of alternate teeth of the saw in accurate alignment; to permit ready inspection, replacement and repair of the several parts, and generally to simplify and renderv more'effective the operation of the various elements of my invention. Other objects will appear from an inspection of the drawings and as hereinafter described and claimed. 1

Prior to the required sharpening of the set teeth of a saw which has become dulled through customary use, it is generally recognized that such teeth must be accurately reset so far as possible in their original alignment; Through the conditions of actual use, the original set is diminished and impaired and as aresult variations in straightness of the saw toothed edge will occur and some of the teeth of such saw inevitably will become forced outr of such alignment, and must be reset in proper alignmentin order to give free running clearance; and to register accurately withjthe sharpening instrument of anymechanical saw Sharpener employed for the purpose, and to prevent the undue cutting away of edges of the teeth or impairment thereof likely to be brought about through such displacement. I know that attempts have beenA made to construct machines for the setting ofhandsaws, but, among other absent novel features of my invention, so far as I am aware no practicable provision has been made in such machines to secure absolute uniformity of the set despite undulations or variations in the depth of the linear extending edge of the saw teeth. Through the use of my apparatus however, any such variation or displacement is immediately and efficiently correct-- ed by mechanicalmeans and the original set restored speedily automatically and completely.

Attention is hereby directed to the drawings,

illustrating a preferred form of my invention, in

which similar numerals of designationrefer to similar parts throughout the several views, and

in which,

Figure 1 is a plan view` of my apparatus, showing a hand saw in operative position for settingof teeth;

Figure 2 is a side elevation of the apparatus shown in Figure 1, looking at the same from the left; c

Figure 3 is an enlarged section partly in elevation on line 3-3 of Figure 1, looking in the direction of the arrows, and illustrating the main operative parts of my invention located just above and adjacent the top or table of my apparatus, the setting jaw being shown in raised position;l

Figurefl is anenlarged section partly in elevation similar to that set forth in Figure 3, the plunger of the setting jaw being shown in operative squeezing position for setting a tooth of the Saw; Y Y

Figure 5 is an enlarged plan-view ofthe parts of the apparatus immediately adjacent to the teeth of the saw and used for advancing the same by application of one of the fingers to each alternate tooth, adjacent parts being shown removed for the purpose of better illustration;

Figure 6 is a section on line 6 6 of Figure 5, looking in the direction of the arrows;

Figure l is an enlarged plan View similar to that set forth invFigure 5, showing one of the feed fingers in retracted position ready to move the next alternate tooth into setting position;

Figure 8 is a View in elevation of -thepart of my apparatus immediately adjacent to the pulley and belt connections to the motor, showing the startingand stopping mechanism in neutral position; Y Y' Figure 9 is a View of the pulley and adjacent parts shown in Figure-8,- showing the pulley belt in operative connection with the motor, and

Figure 10 is a section on line Ill-'I0 of Figure 8, looking in the direction of the arrows. 1

Referring to the drawings, upon the top of a bench or table, Illa is placed in convenient operative position the frame II of my improved apparatus, having the bottom plate I2, uprights I3 and the top plate I4, all-of which are preferably constructed of metal and of one integral piece or are welded together. To the bottom plate l2 is adjustably secured-the basev I5 of the motor I6, the said base being provided with the usual securing slots and bolts employed for the purpose (not shown).

To the undersideof the top plate I 4 is secured the-bearing I'I. by means of 4the bolts I8, and within said bearing is journalled the shaft I9, upon the inner side of which is mounted the eccentric 20, provided with the crank rod 22,` the other end of which rod extends upwardly through the opening 23 in the top plate I4, and is pivotally connected to the wrist pin 24, extending through and secured to the arms 26 of the yoke 25.

To the ends of the arms 26 of said yoke, by means of the bolt 21, is pivotally secured the walking beam 28, the outer end of which terminates in a lip 29 provided with an adjusting screw 38, having a head 3I contacting with the compression spring 32 which rests upon the bow strip 33 connecting said arms. Preferably the said outer end is also provided with the depression 34 arranged to engage with the stop 35, which extends through and is mounted upon said arms 26. The inner end of the said walking beam 28 terminates in the jaw 36, and is provided with an opening 31 through which passes the shaft 38 whose ends are journalled in bearings 39 and 46 mounted upon the top plate I4, and secured thereto by the screws 69. Through thejaw 36,

downwardly extends the opening 4I, the upper part of which is threaded to engage with the' threaded shank of the adjusting screw 42, and the lower part of which is square in cross section and is shaped to engage with the square shank of the setting plunger 43, normally held in place by the set screw 44. Located immediately beneath the said plunger 43 is the anvil 82, which is normally held rigidly between the blocks 85 and 86 welded to the plate I4 a set screw 81, extending through a threaded opening in the block 86 and contacting with one face of said anvil, serving to maintain thesame inoperative position.

As will be observed from Figs. 3 and 4, the opposing parts of thel setting plunger 43 and anvil 82 are shaped to receive, and to conform to theA required set of, the teeth when contacting therewith; the face of said anvil having a bevel at the side thereof registering with said set and the end of said plunger being conformed therewith, Also as will be seen in said drawings, the topof the anvil 82 is extended beyond said conformation so as to receive and support the part of the saw blade adjacent to said teeth while the same are in position to be set.

In order to hold the blade and toothed edge of the'saw 5I! firmly in position while its teeth are being set, I preferably provide the presser foot 45, pivotally mounted uponthe shaft 38 and having at one end the releasing handle 46, and at the other end the foot 41; the pressure spring 4B located between the handle 4'5 and top'plate I4, being provided to normally hold with yielding pressure said presser foot in operative position in contact with the blade of'said saw, and the pressure spring 49 being located between the jaw 36 and the foot 41 and engaging with and being held in place by the stud 5I on the top of said foot.

For the purpose of movingV the teeth ofthe saw progressively from one alternate tooth to the next alternate tooth in alignment therewith, I preferably employ the special form of construction shown in the drawings, having the yoke 52 provided with the arms 53 and 54 connected by the bow strip 55, and having sockets 56 ,shapedv to receive balls 51 upon the inner ends of spreaders 53a and 54a and to form ball and socket joints therewith, and the outer ends of said spreaders being similarly supplied with balls 59 engaging with sockets 58 in the oscillating members 66 and 6I; tension springs 62 and 63 serving to secure and hold together the said members, adjacent to the said spreaders and the arms of the yoke 52, and to insure that the said ball and socket joints are kept in operative position. The members 60 and 6I are pivotally mounted upon the studs 60a and =6Ia secured to top plate I4, and are arranged to oscillate thereon. The said members are pivotally connected at their inner ends by studs 60h and Bib to feed flngers 68e and IIc, the inner ends 60] and 6If of which fingers are respectively curved so as to make contact when required with the adjacent teeth of the saw, and the outer ends '60d and 6Id of which are slidingly connected with the tension springs 66e and 6 Ie, respectively connected by pins to the members 60 and 6 I For the purpose of making the Various adjustments required for feeding the teeth of the saw in the progressive steps required for setting, I provide the adjusting thumb screw 64, having a threaded shank engaging with the threaded opening 66 in the ear 61 of the bracket 68, which is secured to the Atop plate I4 by one of the screws 69; .the steady nut 10 upon the threaded shank of the screw 64, together with the compression spring 1I thereon, serving to hold the said screw 64 in operative position. As will be observed, the lower end of the screw 64 is located so as to contact with the web 12 connecting the arms 53 and 54 of the yoke 52. Forming part of the web 55 is the lip 13, which is connected by the tension spring 14 t0 the pin 15 secured to the walking beam 28.

Y In order to provide for the desired depth of set of the teeth, despite Variations in the linear extending'edge of the same, I prefer to employ a depth guaging mechanism which is located s0 as to be in direct contact'with said teeth as particularly shown in Figs. 5, 6 and '1. The main element of such mechanism is the bar 16, which is positionedimmediately beneath the plate I4 and which is pivoted at one end to the bolt 11 secured to said plate; the opposite end of said bar contacting with the threaded end 18 of the thumb screw 19 extending through the threaded opening 89 of the ear 8 I bra-Zed to the plate I4. As is obvious, the bar- 16 can readily be'adjusted to and from the anvil 82by meansof said thumb screw 19. Riding'upon the said bar 1", and extending above the plate I4, are the brackets 83 and 484, each of which has threaded pairs of legs 83a and 84a extending ldownwardly through' openings 83b and 84b respectively in said plate I4, and secured rmly to said bar as shown; the said openings 83b and 84h being suiciently ample -to provide the desired lateralmovement of said legs therein. Attached to the front of each of said brackets 83 and 84 respectively are the face plates 83o and 84e, secured thereto by screws 83d and 84d. It will be observed that by the turning of the thumb screw 19, the `face plates 830 and 84e can be adjusted toward or from the anvil B2v to the required depth and with the additional adjustment ofthe thumb screw 64 (operating to properly space the feed lingers 66e and 6Ic to make the required contact with every other tooth) the mechanism is Amade ready to receive and set the teeth of the saw. Thereupon the machinery is started through its connections with the motor as hereinafter set forth, and the toothed edge of the saw manually held by theoperator against Y the face plates 83C and 84o and mechanically fed along until setting is accomplished. By this procedure as is obvious the toothed edge of the linear extension of said edge is eliminated and taken care of.

For Vthe"purpovse of operatively'vconn'ectingthe running parts of my apparatus to the motorI mount the pulley 88'upon the outer end of the shaft |79, and connect the said pulley to the pulley "89'of the motor ljby means of the belt 90. `Inorder to` connect or disconnect the said motorI preferably provide the foot pedal 9i, located on the floor below the bench or table Illa, and connect the same by' means ofA the "rod 92 to the outer end of the lever 93 pivotally mounted upon one of the uprights I3; the other end of said lever 93 being arranged to form contact with and to raise or lower the bar 94, and the tension spring 95 serving normallyto hold said bar inthe neutral position shown in the drawings' (see Figs. 8 and 9). Preferably the bar 94 is pivotally mounted upon one ofthe frame bolts 96 of the motor I6, and is provided with the' downwardly depending nger 91 shaped to engage with the: inside edge of the belt 90 and ,to throw the same out of contact with the'pulley 89.

The operation of my improved apparatus is as follows: The first step is to adjust the desired depth of the set of the teeth of the saw by means of the adjusting screw 19 which is turned to the required position, a position which by careful measurements has been accurately predetermined. Then the lever 46 is released to permit the saw, turned to a horizontal position, to present its teeth for the setting operation by resting the same upon the anvil 82 in the position shown in the drawings (see Fig. 2), and at the same time by bringing the said teeth firmly in contact with the face plates 83o and 84e. Thereupon the rst tooth desired to be set is carefully brought-in contact with the end of one of the feed ingers Slc asshown in Fig. 7, in which case the saw (on the starting of the motor and establishment of connections) will progress to the left, while the other finger is left in idling position. Should, however, it be desired that the saw be moved to the right, the feed finger 69e should be employed for the purpose, while the feed nger Glo is arranged to be idle, and adjustments made accordingly. One of these arrangements being rst accomplished, the belt pulley 88 is preferably turned by hand one complete revolution, whereupon by use of the adjusting screw 6A, the feed nger in operation is adjusted to contact the next tooth in alternate progression, and the apparatus is ready for automatic operation. Upon the motor being started, and operative connection being made through the belt A9|) with my apparatus, the setting of alternate teeth of the saw will be accomplished Without Ifurther attention of the operator, except to hold the saw in horizontal position against the face plates and to remove the saw at the end of the operation. Through the progression on one direction of the saw teeth through my apparatus as actuated by feed finger Bic, the alternate teeth protruding from one side of the saw are set by squeezing each tooth down upon the anvil; and through the progression in the opposite direction of the alternate teeth on the opposite side of the saw as actuated by feed finger 60o the setting of the remainder of the teeth in like manner Will be automatically completed.

In the claims, by the words variations in the linear extending edge of the teeth or language equivalent thereto, I desire to be understood as meaning any elevation, depression, undulation, or change in such edge amounting to any departure no matter how slight from the straight line following such edge whether such departure be lateral or longitudinal of the blade of said saw.

My invention may be embodied in other specie forms without departing from the spirit or essential characteristics thereof. The present embodiment, as above set forth, is therefore to be considered in all respects as illustrative and not restrictive, the scope of my invention being indicated by the appended claims rather than by the `foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Y

What I claim. and desire to secure by Letters Patent is:

l. In a saw setting machine, an anvilvto have engaged thereagainst a saw to be set, arockable beam, a plunger element Vcarried by said beam to` engage individual teeth of a saw engaged against said anvil and todeiiect and thereby set said teeth in response' to rocking movement of said beam, means for rocking said beam, a yoke element rockable by and with said beam,y anarm pivotedA intermediate its ends for oscillation in a plane at right angles to the plane of rocking movement of said yoke element, a nger on one end of said arm for engagement with a tooth 0f the saw to advance the latter in response to os cillation of said arm, and a connection including a spreader element between said yoke element and the other end of said arm whereby the latter is oscillated to eifect advance of the saw to present a new tooth to be set in response to rocking movement of said beam. 1

2. A saw setting machine as set forth in claim 1 in which the finger is pivoted to the arm for swinging movement between an operative and an inoperative position relative to the saw teeth, and in which a spring is shiftably engageable in either of two different operative positions with said linger to hold the latter in either an operative or an inoperative position relative to the saw teeth.

3. A saw setting machine as set forth in claim 1 including means adjustable to vary the amount of rocking movement of the yoke element effected by rocking movement of the beam thereby to vary the amount of oscillation of the arm and finger to adapt the latter for cooperation with saw teeth of different lengths.

4. A saw setting machine comprising an anvil to have clamped thereagainst a saw to be set, a beam rockable in a plane at right angles to said anvil, a plunger carried by said beam to enga-ge a tooth of a saw clamped against said anvil and to deflect and thereby set said tooth in response to rocking movement of said beam, means for rocking said beam, a rcckable presser foot to engage the saw and clamp the same against said anvil in response to tooth setting rocking movement of said beam, spring means between said beam and said presser foot through which the former acts to cause the latter to yieldably clamp the saw against said anvil, a yoke rockable in a plane at right angles to said anvil, means where- -by rocking movement of said beam effects rocking movement of said yoke, a pair of arms one on either side of said yoke pivoted for oscillation in a plane at right angles to the plane of oscil-V lation of said yoke, a fingerv carried by each arm for engagement with a tooth of the saw to ad- Vance the latter in response to oscillation of the related arm, connections between said yoke and said arms whereby rocking of said yoke oscillates said arms, and means for rendering the nger ofreither arm operative and the nger of the other arm inoperative to effect advance of the saw.

5. In an :apparatus for setting saw teeth, a base, an anvil on the base, a rockable beam and a saw clamping device coaxially pivoted to the base; and means for automatically and progressivelyT feeding a saw over said anvil, said means comprising; a yoke also pivoted co-axially with the beam and clamping device and having a transverse web, a bracket carried by the base, an adjusting screw carried by the bracket and engaging said web of the yoke, a pair of levers connected to the base by vertical pivots, spring tensioned feeder fingers carried by the front-end of each lever, means for selectively rendering one of said feed iingers operative relative to the teeth of a saw, contractile springs connected to the inner ends of said levers tending to rock the outer ends of said levers carrying the feeder ngers in opposite directions, and spreader links between the outer rear ends of the yoke and the inner sides of said levers for actuating said levers against the tension of said springs.

6. An apparatus for setting the teeth of saws, comprising, in combination, a base, an anvil .on the base, a beam pivotally mounted adjacent the anvil and having front and rear ends extending forwardly and rearwardly of its pivotal mounting, means connected to the rear end of the beam for rocking the same on its pivot, a setting plunger carried by the beam for cooperation with said anvil, a clamping device pivoted coaxially with the beam, said clamping device including la presser-foot for positioning a saw on the anvil in operative position to be engaged by the setting plunger, a spring between said presser-foot and the front end of the beam, another spring between the base and the rear portion of the clamping device, said springs tending to rotate the presserfoot toward the anvil, and means on the base operatively connected with said beam for progressively feeding a saw between said presser-foot and the anvil in synchronism with the operation of the setting plunger carried by the beam.

BYRON G. DAGGETT. 

